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Ash glazes are types of high temperature glaze
Ceramic glaze

Glaze is a layer or coating of a vitreous substance which has been fired to fuse to a ceramic object to color, decorate, strengthen or waterproof it....
s for stoneware
Stoneware

Stoneware a vitreous or semi-vitreous ceramic ware of fine texture made primarily from non-refractory fire clay....
 pottery
Pottery

Pottery is the ceramic ware made by potters. Major types of pottery include earthenware, stoneware, and porcelain. The places where such wares are made are called potteries....
 that include the ashes of trees, shrubs, plants or grasses within the glaze recipe.

Plant ashes are a complex mixture that reflect the nutritional requirements, and therefore composition, of the living plant. High in calcium and also incorporating other alkaline material, ash behaves as a flux, encouraging the glass forming oxide silica to melt at a temperature within the scope of a pottery kiln.






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Ash glazes are types of high temperature glaze
Ceramic glaze

Glaze is a layer or coating of a vitreous substance which has been fired to fuse to a ceramic object to color, decorate, strengthen or waterproof it....
s for stoneware
Stoneware

Stoneware a vitreous or semi-vitreous ceramic ware of fine texture made primarily from non-refractory fire clay....
 pottery
Pottery

Pottery is the ceramic ware made by potters. Major types of pottery include earthenware, stoneware, and porcelain. The places where such wares are made are called potteries....
 that include the ashes of trees, shrubs, plants or grasses within the glaze recipe.

Plant ashes are a complex mixture that reflect the nutritional requirements, and therefore composition, of the living plant. High in calcium and also incorporating other alkaline material, ash behaves as a flux, encouraging the glass forming oxide silica to melt at a temperature within the scope of a pottery kiln. Ash glazes often have a characteristic mottled or streaky texture, depending on the amount of ash incorporated.